A tragic incident occurred during the investigation of the historic Kyuseki coal mine, resulting in the death of a diver. The diver, whose identity is yet undisclosed, was part of a team surveying the underwater sections of the defunct mine. The disaster took place despite safety precautions being adhered to. The circumstances and cause of the accident are currently under investigation.

Japan's mining history holds a significant place in Japanese society. Incidents such as the Kyuseki mishap heighten public concerns regarding safety standards and regulations in historic relic explorations. Besides, it is also a reminder of the human loss endured during Japan's industrial growth phase.

In the US or EU, similar situations would lead to calls for a comprehensive review and possible overhaul of safety protocols. Public interest in historical sites and natural wonders is balanced with an expectation of safety and care for those participating in explorations.